Prince Harry and King Charles have been on diverging paths for many years now, with no end in sight to their ongoing estrangement.
From the Duke of Sussex's perspective, his father has failed to apologise for the actions of those he feels have failed him such as Queen Camilla and Prince William.
Even Charles's cancer diagnosis has failed to convince his son to bury the hatchet and there are real fears the pair will never settle their differences.
That could end Charles's desire to build a relationship with his two grandchildren, Prince Archie, 5, and Princess Lilibet, 3.
And a new front in their feud looks to have opened, and Queen Camilla once again finds herself at the centre of it.
Harry has been extremely critical of his stepmother, accusing her of leaking stories to the press and describing her as "dangerous".
We reported that he and Prince William have cruel nicknames for Camilla, 77, who was infamously the 'third person' in the relationship between Charles and Princess Diana.
So Harry may take some delight in the fact he is in line to put a huge dampener on Camilla's 80th birthday celebrations. Camilla will turn 80 on July 17, 2027 - the same month the next edition of Harry's Invictus Games takes place in Birmingham.
The Daily Mail's well-connected Ephraim Hardcastle column said the diary clash "irks" the King who is hoping to host "lavish celebrations" for his wife.
According to the column, the King is already "planning to pull out all the stops for his Queen, with events centring on a thanksgiving service at St George's Chapel in Windsor".

It also noted that Harry is unlikely to lose any sleep over his event becoming a distraction due to his feelings for Camilla.
In his memoir Spare, he writes: "The need for her to rehabilitate her image… that made her dangerous because of the connections that she was forging within the British press.
And there was open willingness on both sides to trade information and with a family built on hierarchy, and with her on the way to being Queen Consort, there was going to be people or bodies left in the street because of that."